Question

Complete the following reaction:

$\mathrm{Fe}+\mathrm{S}\stackrel{\mathrm{heat}}{\to }$

Answer 1

Thermal decomposition:

• Some reactions occur only by heating.
• For example, iron($\mathrm{Fe}$) and sulphur($\mathrm{S}$) do not react on mixing but on heating combine to form iron sulphide($\mathrm{FeS}$).
• $\underset{\mathrm{iron}}{\mathrm{Fe}}+\underset{\mathrm{sulphur}}{\mathrm{S}}\stackrel{\mathrm{heat}}{\to }\underset{\mathrm{iron}\mathrm{sulphide}}{\mathrm{FeS}}$